Fitt’s Law

Fitt’s Law is especially useful in human-machine interfaces.

It defines the time required to point (finger, mouse pointer) at a target based on it’s realtive position and size.

The two simplest examples would be a 1px x 1px button on the far corner of the screen, versus a 300px x 200px  button immediately next to the pointer. It explains the advantage of radial “pie menus”, right-click context menus, and automatic mouse pointer repositioning in O/S popup windows.


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